Two-cycle combustion-engine.



C. W. FOWLER. TWO-CYCLE COMBUSTION ENGINE. APPLICATION FILED APRJH. 19-16.

Patented Sept. 18, 1917'.

r WED ws rrarnn'ir ormnnns w. rownnn, or BALTIMORE, MARYLAND.

TWO-GYGLE- GOMBUSTION-ENGINE.

reac es.

' of which the following is a specification.

This invention relates to two-cycle inter nal-combustion engines having separate exploslon and compression cylinders or chambers in each of WhlCh' a-plston works, the

two pistons being connected to work to,

' gether.

The present invention relates more particularly to the means whereby the com pressed charge is admitted to the explosion chamber, and the object of the invention is to provide a novel and improvedmeans for effecting a transfer of the compressed charge from the compression cylinder to the explosion cylinder. The two cylinders are separated by a partition having an opening in which works a rod or stem connecting the two pistons, said stem having a means for establishing communication between the cylinders at the proper time to effect the transfer of the charge, and said means being so arranged that wear and consequent leakage are reduced toa minimum.

The. invention also has for its object to provide a structure which will admit the compressed charge in such a way that the spent gases in the explosion chamber are thoroughly swept out of the same.

With the object stated in view, the invention consists in a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

In the drawing, Figure 1 is a vertical section of the engine; Fig. 2 is a horizontal section on the line 22 ofFig. 1.

Referring specifically to the drawing, 5 and 6 denote, respectively, the explosion and compression cylinders or chambers of the engine, the same being mounted in axial alinement, and the explosion chamber being mounted on a closed crank case 7 into which it opens, the crank case being designed to hold a lubricant, the engine being lubricated by the splash system.

The piston working in the cylinder 5 is shown at 8, and the piston of the cylinder Specification of Letters Patent.

Application filedApril 11, 1916. Serial No. 90,313.

Patented Sept. raisin.

6 at 9. These two pistons travel together, they being connected by a stem 10.. The two cylinders are separated by a partition 11 having an opening provided with a stuffing box 12 through which the stem 10 passes. The stufling box contains a suitable packing 13 held down by a gland 14E.

. The cylinder has an exhaust port 15 which is uncoveredby the piston 8 at the end of the firing stroke to allow the spent gases to escape. H t

:The cylinder 6 has an inlet 16 connected to a carbureter or other suitable chargeforming device.

The stem 10, adjacent to its end which is connected to the piston 9, has an external spirally arranged groove 18. This groove is of such length that at the end of the compression stroke of the piston 9 it establishes communication between the cylinders 5 and 6, and thus allows the compressed charge in the latter cylinder to pass into the former.

It has been proposed, heretofore, to effect the transfer of the compressed charge by a number of longitudinal slots cut in the circumference of the stem connecting the two pistons, but this structure results in rapid wear of the packing and gland of the stuffing box, the metal between the slots in contact with the packing and the gland wearing grooves therein, with the result that after the engine has run a while, the charge leaks through the stufling box and escapes into the cylinder 5 too soon, resulting in a waste of fuel and loss of power. This diificulty is entirely overcome by substituting the spiral groove 18 for the straight slots, as the stem 10 now has a perfect wearing fit where it passes through the stuffing box 12, and it will not cut grooves or score the packing and the gland.

Another advantage of the spiral groove 18 is that the charge is delivered into the explosion cylinder 5 with a whirling motion,

caused by the lower end of the groove being formed smooth and shoulderless to allow a free discharge of gas therethrough, and also inclined in a direction to cause the gas to initially contact with the explosion chamber wall adjacent its upper end, thus resulting in the spent gases in said cylinder being thoroughly swept out of the same, so that the successive fresh charges are not mixed .with residual burned gases from a previous charge.

At 19 is shown a grease cup having a connection 20 with the stuffing box 12 to supply the cylinder 5, the piston 8 has in itswall a series of ducts 22 opening therethrough to the cylinder wall. The oil splashed up by thecrank into the piston passes through theseducts and is carried along the same to the cylinder wall, thus keeping the latter supplied with a lubricant.

Aminternal combustion engine, comprising axially alined explosion and compression chambers separated by a partition havin a a central opening therethrough, said explosion and compression chambers being. provided at their lower ends with an exhaust and inlet port respectively, pistons in said cham- Oopies 01 this patent may be obtained for flve cents each, by addressing the a a Washington, D. 0.

bers, anda stem connecting said pistonsand passing through the opening of said partition, said stem having a single continuous exterior passageway completely encircling said stem and of such length as to establish communication between the chambers at the end of the compression stroke of the piston in the compression chamber, the lower end of said exterior passageway being 3Q charge .of gas therefrom and also inclined' smooth and shoulderless to allow a free dis- Commissioner of Patents;

OHARLESW; FOWLER} 

